Biel has signed on to star in and produce the raunchy comedy "F***ing Engaged," which follows a couple who vows to have sex every day leading up to their wedding with the hopes of avoiding becoming their boring old parents, according to The Hollywood Reporter.

"Engaged" is the first feature screenplay from writer Julia Brownell, whose stage writing credits include "Smart Cookie" and "Fantasy Baseball."

Biel will next hit the big screen in the ensemble romantic comedy "Valentine's Day," in February 2010. Her other upcoming credits include the comedy "Nailed" with Jake Gyllenhaal and "The A-Team" reboot, which storms theaters in June 2010.